How to Fertilize giant hyssop 'Raspberry Summer'?
Herb flower diluted feed every three weeks warm months

giant hyssop 'Raspberry Summer' · Agastache 'Raspberry Summer'
Grow as an annual in colder areas, or as a perennial in warmer areas, in well-drained, fertile soil in full sun in a sheltered position, such as against a south-facing or west-facing wall
Herb flower diluted feed every three weeks warm months